Automatic ramp load sense for power tools

A power tool comprising:

• a motor;
• a power switching network coupled between a battery pack interface and the motor;
• and
• a controller connected to the power switching network to control operation of the motor, the controller configured to:
• provide pulse-width modulated (PWM) signals to the power switching network to control operation of the motor;
• determine a change in a load state of the motor, the load state indicating whether the power tool is in a loaded state or an unloaded state;
• ramp up a duty ratio of the PWM signals in discrete intervals in response to the load state changing from the unloaded state to the loaded state;
• and
• ramp down the duty ratio of the PWM signals in discrete intervals in response to the load state changing from the loaded state to the unloaded state.

A method for operating a power tool, the method comprising:

• providing, using a controller of the power tool, pulse-width modulated (PWM) signals to a power switching network to control operation of a motor of the power tool;
• receiving, using the controller, a command to change motor speed;
• and
• ramping, using the controller, the PWM signals based on the command in discrete intervals.